The possible logistics vary, of course, but you don't have to rush just because they have to rush. I know of many photographers in the same situation who show up 45 minutes to an hour ahead of time, set up an arbitrarily complex lighting scheme as desired and appropriate in a conference room or office using any spare body standing around to stand in while adjusting the lights. Once everything is set up, the executive pops in, spends 10 minutes and leaves.